feat(spdk): Support changing volume size

[AaronDewes]

Which issue(s) this PR fixes:

https://github.com/longhorn/longhorn/issues/8022

What this PR does / why we need it:

Currently, SPDK volumes can not be expanded. This aims at fixing this.

Special notes for your reviewer:

I've not contributed to Longhorn before and this is completely untested. I'm trying to implement & test this feature, this is just a draft.

Additional documentation or context

Depends on https://github.com/longhorn/longhorn-instance-manager/pull/415

[derekbit]

Need to update the function. cliAPIVersion is always 0 for v2 volume, so skip the check.

func IsValidForExpansion(engine *longhorn.Engine, cliAPIVersion, imAPIVersion int) (bool, error) {
	if engine.Status.IsExpanding {
		return false, nil
	}
	if engine.Spec.VolumeSize == engine.Status.CurrentSize {
		return false, nil
	}
	if engine.Spec.VolumeSize < engine.Status.CurrentSize {
		return false, fmt.Errorf("the expected size %v of engine %v should not be smaller than the current size %v", engine.Spec.VolumeSize, engine.Name, engine.Status.CurrentSize)
	}

	if datastore.IsDataEngineV1(engine.Spec.DataEngine) {
		if cliAPIVersion < engineapi.CLIAPIMinVersionForExistingEngineBeforeUpgrade {
			return false, nil
		}

		if !engineapi.IsEndpointTGTBlockDev(engine.Status.Endpoint) {
			return true, nil
		}
		if cliAPIVersion < 7 {
			return false, fmt.Errorf("failed to do online expansion for the old engine %v with cli API version %v", engine.Name, cliAPIVersion)
		}
		if imAPIVersion < 3 {
			return false, fmt.Errorf("failed do online expansion for the engine %v in the instance manager with API version %v", engine.Name, imAPIVersion)
		}
	}

	return true, nil
}

[innobead]

@AaronDewes any updates?

[coderabbitai[bot]]

[!IMPORTANT]

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

---

Thank you for using CodeRabbit. We offer it for free to the OSS community and would appreciate your support in helping us grow. If you find it useful, would you consider giving us a shout-out on your favorite social media?

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

🪧 Tips

Chat

There are 3 ways to chat with CodeRabbit:

• Review comments: Directly reply to a review comment made by CodeRabbit. Example:
  • I pushed a fix in commit <commit_id>, please review it.
  • Generate unit testing code for this file.
  • Open a follow-up GitHub issue for this discussion.
• Files and specific lines of code (under the "Files changed" tab): Tag @coderabbitai in a new review comment at the desired location with your query. Examples:
  • @coderabbitai generate unit testing code for this file.
  • @coderabbitai modularize this function.
• PR comments: Tag @coderabbitai in a new PR comment to ask questions about the PR branch. For the best results, please provide a very specific query, as very limited context is provided in this mode. Examples:
  • @coderabbitai gather interesting stats about this repository and render them as a table. Additionally, render a pie chart showing the language distribution in the codebase.
  • @coderabbitai read src/utils.ts and generate unit testing code.
  • @coderabbitai read the files in the src/scheduler package and generate a class diagram using mermaid and a README in the markdown format.
  • @coderabbitai help me debug CodeRabbit configuration file.

Note: Be mindful of the bot's finite context window. It's strongly recommended to break down tasks such as reading entire modules into smaller chunks. For a focused discussion, use review comments to chat about specific files and their changes, instead of using the PR comments.

CodeRabbit Commands (Invoked using PR comments)

• @coderabbitai pause to pause the reviews on a PR.
• @coderabbitai resume to resume the paused reviews.
• @coderabbitai review to trigger an incremental review. This is useful when automatic reviews are disabled for the repository.
• @coderabbitai full review to do a full review from scratch and review all the files again.
• @coderabbitai summary to regenerate the summary of the PR.
• @coderabbitai generate docstrings to generate docstrings for this PR. (Beta)
• @coderabbitai resolve resolve all the CodeRabbit review comments.
• @coderabbitai configuration to show the current CodeRabbit configuration for the repository.
• @coderabbitai help to get help.

Other keywords and placeholders

• Add @coderabbitai ignore anywhere in the PR description to prevent this PR from being reviewed.
• Add @coderabbitai summary to generate the high-level summary at a specific location in the PR description.
• Add @coderabbitai anywhere in the PR title to generate the title automatically.

CodeRabbit Configuration File (.coderabbit.yaml)

• You can programmatically configure CodeRabbit by adding a .coderabbit.yaml file to the root of your repository.
• Please see the configuration documentation for more information.
• If your editor has YAML language server enabled, you can add the path at the top of this file to enable auto-completion and validation: # yaml-language-server: $schema=https://coderabbit.ai/integrations/schema.v2.json

Documentation and Community

• Visit our Documentation for detailed information on how to use CodeRabbit.
• Join our Discord Community to get help, request features, and share feedback.
• Follow us on X/Twitter for updates and announcements.

[mergify[bot]]

This pull request is now in conflict. Could you fix it @AaronDewes? 🙏

[innobead]

Thanks, @AaronDewes, for your contribution. I am going to close this, as @davidcheng0922 is actively working on this, and the feature is scheduled for release in the upcoming 1.10. Please follow the progress in that issue and provide us with feedback there.